\[x^{2} + x - 30\]
\[x_{1} + x_{2} = - 1;\ \ x_{1} \cdot x_{2} = - 30\]
\[x_{1} = - 6;\ \ x_{2} = 5\]
\[x^{2} + x - 30 = (x + 6)(x - 5).\]